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UNITED STATES PATENT OFFICE.

WILHELM PIOKHARDT, OF NEW YORK, AND HERMANN ENDEMANN, OF

BROOKLYN, N. Y., ASSIGNORS TO SAID- PIOKHARDT AND ADOLF KUT- TROFF, OFNEW YORK, N. Y.

NEUTRAL TANNATE OF CHINOLINE.

SPECIFICATION forming part of Letters Patent No. 260,318, dated June 27,1882.

Application filedMay 3,1882. (Specimens) To all whom it may concern:

Be it known that we, WILHELM PIOKHARDT, a citizen of the United States,residing at New York, in the county and State of New York, and HERMANNENDEMANN, a citizen of the United States, residing at Brooklyn, in thecounty of Kings and State of New York, have invented new and usefulImprovements in Ohinoline Compounds, of which the following is aspecification.

This invention relates to a compound which is obtained by the action oftannic acid on chinoline.

In carrying out our invention we take the chinoline of Skraup, orprepare such chinoline according to the patent granted to Zdenko H.Skraup, May 17, 1881, No. 241,738, and then 7 we free the same from theimpurities mixed therewith by treating it with tartaric acid,

whereby a tartrate of chinoline is obtained,

and then we liberate from this salt the chinoline bytreating its aqueoussolution with caustic alkalies.

In preparing our new compound we take 62.4 pounds of tannic acid andtwenty-six pounds of chinoline, or, in other words, about five pounds oftannic acid to two pounds of chinoline, and add thereto a very smallquantity of water, the mixture being heated on a water bath and stirreduntil the water has that by the addition of tannic acid to ehinoline thepeculiar odor of the chinoline is almost entirely destroyed.

What we claim as new, and desire to secure by Letters Patent, is-

As anew article of manufacture, the neutral tannate of chinoline havingthe properties above stated.

In testimony whereof we have hereunto set our hands and seals in thepresence of two subscribing witnesses.

WM. PIOKH-ARDT. H. ENDEMANN.

Witnesses:

W. HAUFF, E. F. KASTENHUBER.

[L. s [L. s.]

